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# Assignment 2 Physics (PHY101)

OSCILLATIONS: I

Assignment 2: (Spring 2013)
PHYSICS (PHY101)
TOTAL MARKS: 25
Due Date: 16/05/2013

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Don’t wait for the last date to submit your assignment.

Question # 1
Is it true or wrong that a point on a wheel rotates from 12 o’clock to 3 o’clock, so its angular
displacement is 90 degrees? If yes explain it if no write its reason. Marks = 4

Question # 2
A potter’s wheel rotates. A location farther from the axis will have a greater angular velocity
than one closer to the axis. Either yes or no explain in each case. Marks = 5

Question # 3
a. Can you write the basic reason of resonance? Is there any role of natural frequency in this
phenomenon or not?
b. Generally it is accepted about the slope at any point on the displacement graph of an
object in SHM (Simple Harmonic Motion) is its velocity. Are you agree it or not?
Marks = 7 (4+3)
Physics (PHY101) VU of Pakistan

Question # 4
I have a baseball bat. I shave off some weight from the handle and put it on the head of the bat. A
baseball player thinks I have changed the bat’s moment of inertia. Is he right? Marks = 4

Question # 4
a. Is it true to consider ‘torque’ as a ‘force’? Give its explanation.
b. A torque that causes counterclockwise acceleration is a positive torque or negative.
Marks = 5(3+2)

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### Replies to This Discussion

lets start discussion on 2nd assignment

i think 1st Q is true

aray jab 1st Q true hai tu is mein mu chupanay ki kia bat hai

koi reason tou ho

Assignment dicuss krein

topic kon sa h?

Question 1 mein option (d) correct hai kyun ke space mein vacuum hai koi electrons ya other particals ya iar nahi hai light electromagnetic wave hai jis mein koi mass bound body ya charged particles nahi hain
Question 2

idea solution

Gravitational Potential Energy

From the work done against the gravity force in bringing a mass in from infinity where the potential energy is assigned the value zero, the expression for gravitational potential energy is

This expression is useful for the calculation of escape velocity, energy to remove from orbit, etc. However, for objects near the earth the acceleration of gravity g can be considered to be approximately constant and the expression for potential energy relative to the Earth's surface becomes

where h is the height above the surface and g is the surface value of the acceleration of gravity.

Gravitational potential energy is acquired by an object when it has been moved against a gravitational field. For example, an object raised above the surface of the Earth will gain energy, which is released if the object is allowed to fall back to the ground. In order for an object to be lifted vertically upwards, work must be done against the downward pull of gravity. This work is then stored as gravitational potentialenergy. When the object is released and falls towards the Earth, the potential is converted into kinetic energy, or movement.

A pendulum is a good example of the relationship between gravitational potential and kinetic energy. At its highest point, the pendulum has only potential energy. As it descends, this is converted into kinetic energy, reaching a maximum at its lowest point, where it has no potential energy. As it swings up again, the kinetic is converted to potential energy.

Q4: Option e is correct:

The law of inertia states that it is the tendency of an object to resist a change in motion. According to Newton, an object will stay at rest or stay in motion (i.e. 'maintain its velocity' in modern terms) unless acted on by a net external force, whether it results from gravity, friction, contact, or some other source. The Aristotelian division of motion into mundane and celestial became increasingly problematic in the face of the conclusions of Nicolaus Copernicus in the 16th century, who argued that the earth (and everything on it) was in fact never "at rest", but was actually in constant motion around the sun.[11] Galileo, in his further development of the Copernican model, recognized these problems with the then-accepted nature of motion and, at least partially as a result, included a restatement of Aristotle's description of motion in a void as a basic physical principle:

A body moving on a level surface will continue in the same direction at a constant speed unless disturbed.[12]
Galileo writes that 'all external impediments removed, a heavy body on a spherical surface concentric with the earth will maintain itself in that state in which it has been; if placed in movement towards the west (for example), it will maintain itself in that movement'. This notion which is termed 'circular inertia' or 'horizontal circular inertia' by historians of science, is a precursor to, but distinct from, Newton's notion of rectilinear inertia For Galileo, a motion is 'horizontal' if it does not carry the moving body towards or away from the centre of the earth, and for him 'a ship, for instance. having once received some impetus through the tranquil sea, would move continually around our globe without ever stopping

Q5 mein work ki equation se e sab explain ho jata hai w= fxd

to 1st case mein empty ke sath distance taye hua work hua second case mein jab distance tha e nai chahe ghanta laga to equation se work to zero ho gaya

and plz! plz! plz! is ko just idea he smjna

yar jo jo mujy mila ha wo manay uplod kar dea ha

if any body have any batter solution plz! shearrrrrrrrrrrr

Any solution so far...?

Can anyone help me out...today is the last day to submit assignment...

WHAT IS TORQUE?
Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis, which we will call the pivot point, and will label 'O'. We will call the force 'F'. The distance from the pivot point to the point where the force acts is called the moment arm, and is denoted by 'r'. Note that this distance, 'r', is also a vector, and points from the axis of rotation to the point where the force acts. (Refer to Figure 1 for a pictoral representation of these definitions.)

Q.4 A

. Force is any influence that can change an object's motion or geometric configuration. For instance, if a push a cart and it moves forward, I applied force to cart (hence, it accelerated)....

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